Magnetism in Re-based ferrimagnetic double perovskites

A. Winkler; N. Narayanan; D. Mikhailova; K. G. Bramnik; H. Ehrenberg; H. Fuess; G. Vaitheeswaran; V. Kanchana; F. Wilhelm; A. Rogalev; A. Kolchinskaya; L. Alff

doi:10.1088/1367-2630/11/7/073047

Magnetism in Re-based ferrimagnetic double perovskites

Materials Science 2009-09-02 v1 Strongly Correlated Electrons

Authors: A. Winkler , N. Narayanan , D. Mikhailova , K. G. Bramnik , H. Ehrenberg , H. Fuess , G. Vaitheeswaran , V. Kanchana , F. Wilhelm , A. Rogalev , A. Kolchinskaya , L. Alff

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Abstract

We have investigated spin and orbital magnetic moments of the Re 5d ion in the double perovskites A2FeReO6 (A = Ba, Sr, Ca) by X-ray magnetic circular dichroism (XMCD) at the Re L(2,3) edges. In these ferrimagnetic compounds an unusually large negative spin and positive orbital magnetic moment at the Re atoms was detected. The presence of a finite spin magnetic moment in a 'non-magnetic' double perovskite as observed in the double perovskite Sr2ScReO6 proves that Re has also a small, but finite intrinsic magnetic moment. We further show for the examples of Ba and Ca that the usually neglected alkaline earth ions undoubtedly also contribute to the magnetism in the ferrimagnetic double perovskites.

Keywords

double perovskites ferrimagnetism X-ray magnetic circular dichroism rhenium spin magnetic moment orbital magnetic moment

Cite

@article{arxiv.0909.0209,
  title  = {Magnetism in Re-based ferrimagnetic double perovskites},
  author = {A. Winkler and N. Narayanan and D. Mikhailova and K. G. Bramnik and H. Ehrenberg and H. Fuess and G. Vaitheeswaran and V. Kanchana and F. Wilhelm and A. Rogalev and A. Kolchinskaya and L. Alff},
  journal= {arXiv preprint arXiv:0909.0209},
  year   = {2009}
}

Magnetism in Re-based ferrimagnetic double perovskites

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